I'm planning on using two electric fans on my Triumph GT6 Golf radiator installation. I'dlike to set it up so that, using a three terminal
two temperature switch, one fan comes on at the first temperature and both come on when the second (highest) temperature is reached.
So, the question; When the higher temperature is reached are both switch contacts live or just the higher one?
Thank you
John
Well that will depend on the switch won't it!
There are a lot of different configurations and finding the right one for your needs will take some detective work.
In principle a three connection switch should open one circuit then the second running both fans then turn both off when cool enough.
However there are systems that overlap the turn off and phase on the fans.
one rad I found in a skip had two thermo switches with relays, surface heat sensors and a small pump that moved water within the rad.
quote:
Originally posted by snapper
Well that will depend on the switch won't it!
There are a lot of different configurations and finding the right one for your needs will take some detective work.
In principle a three connection switch should open one circuit then the second running both fans then turn both off when cool enough.
However there are systems that overlap the turn off and phase on the fans.
one rad I found in a skip had two thermo switches with relays, surface heat sensors and a small pump that moved water within the rad.
I used a switch off a VW Jetta, it has what you are wanting. (1st contact make, then both contacts make).
It's a standard M22 thread, but I broke open the plastic end tank on the Jetta and that gave me a boss I could solder onto the Allegro !
radiator I'm using.
If you look here http://www.tridon.com.au/Products/Product.aspx?SG=8&S=35&G=483&P=2014 you can find the switch diagram, then
find what UK car its also used on.
http://www.tridon.com.au/databank/documents/Switch-Application-list'05.pdf
[Edited on 28-12-11 by ken555]
quote:
Originally posted by ken555
I used a switch off a VW Jetta, it has what you are wanting. (1st contact make, then both contacts make).
It's a standard M22 thread, but I broke open the plastic end tank on the Jetta and that gave me a boss I could solder onto the Allegro ! radiator I'm using.
If you look here http://www.tridon.com.au/Products/Product.aspx?SG=8&S=35&G=483&P=2014 you can find the switch diagram, then find what UK car its also used on.
http://www.tridon.com.au/databank/documents/Switch-Application-list'05.pdf
[Edited on 28-12-11 by ken555]
If you buy a switch and you find it's only one switch at a time just get some diodes and bobs your uncle. You'll get a slight voltage drop across the diodes but hey ho.